Not sure about RR denim specifically, but most of the line is China made, albeit decent quality.
Pimpy is talking about the Levis Vintage Clothing 501’s cinch back, which I think for the most part are Turkey made.
Levis used to manufacture the actual denim in North Carolina and assemble elsewhere, but not sure that’s the case anymore.
You can still find vintage ones that are California made with NC Cone Mills denim, although they are about 50% more expensive than the retail ones.
Regardless of cinch, I agree that Levis jeans + PRL polo is as mainstream as it gets, the ultimate suburban dad look.
When I think of non-mainstream denim I think of small Japanese producers - Momotaro, Studio D’artisan, etc